The sharpness is distributed for the small converter for 400 euros quite unevenly over the picture field, and open as closed, the corners are weaker than the middle – nevertheless digitally recommended for the three hundred (5500 euros). The version with the factor of two for 500 euros works more evenly, but this is mainly due to the worsening of the middle.
Nikon AF-S Nikkor 2.8 / 300mm VR II G ED - TC-20E III (Nikon D3x)
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